Make GD LeSecurityTest pass on real devices

This patch contain couple fixes that stabilize LeSecurityTest
When running with --host flag, the virtual execution environment is much
more stable, but on real devices more guarantees around address handling
and disconnection are needed.

Bug: 155399771
Test: cert/run LeSecurityTest
Tag: #gd-refactor
Change-Id: I1f2d7e58600168140009458a2d31509edc19e8c4